...CCND1 amplification occurs in many cancer types, correlates with shorter overall survival and inferior outcomes with ICIs therapy…The gene set enrichment analysis suggested that CCND1 amplification correlates with multiple aggressive, immunosuppressive hallmarks including epithelial mesenchymal transition, TGF-β signaling, KRAS signaling, PI3K/AKT/mTOR signaling, p53 pathway and hypoxia signaling in solid tumors.